I assume the early in early German cinema ends with Weimar. You should basically be aware that
a) many of the films are lost
b) of the surviving films many have survived incomplete and were changed one way or the other
c) of these films outside of archives only a fraction is available on DVD, screenings, Youtube or underground channels on the internet
d) what you get on DVD in decent restored transfers is again a tiny selection which corresponds to and reflects the way these films were perceived by critics and is in no way representative (though this is true for most classical cinemas).
Especially problematic for Weimar cinema is a scholarship that was and partly still is plagued by the shadows of the Third Reich and stupid attempts to somehow extract signs from the films of the things to come. So first, forget Hitler. The second major problem is the frequent association of early German cinema with expressionism which is mostly nonsense from an art historian's perspective. There is half a dozen films which is indeed visually influenced by Expressionism and a considerably larger chunk influenced by Romanticism, see e.g. Nosferatu. But again this is a small chunk out of thousands of genre films in all varieties which you however mostly will not be able to see.
That being said German film is internationally renowned for three innovative aspects, one indeed being the Kammerspielfilm or chamber drama mostly written by Carl Mayer which is mentioned in the previous post. The second is a design approach to film which means that the picture is conceived as a painting surface to be filled either with architectural design in the early 20s, see
Caligari, or later with an approach more based on lighting, see e.g.
Faust. Third German cinematographers especially Karl Freund are credited with the unchained camera which means the modern freely roaming camera which explores film space, see the mentioned
Der letzte Mann (The last laugh).
Less prominent in international discussion but no less important is the German mountain film for outdoor fictional filmmaking as well as the early sounf operettas.
You've already seen the four most famous films (though hardly the best). So a suggested curriculum would be
1) German Lubitsch. Get
Madame Dubarry as the most prominent and watchable of the large scale German epics of the inflation era (1919-23) which were widely exported. It's reasonably entertaining, has a great leading lady with Pola Negri and represents Lubitsch already grasping American fast cutting. The film is available from MoC which is also true for his comedies which are available in a nice and currently cheap box.
Die Austernprinzessin,
Die Puppe and
Die Bergkatze are terrifically funny and partly very stylized especially the last film. The films are a nice andidotes to the usual stupid cliches about German doom, gloom and humourlessness.
2) To complement the architectural/design approach of
Caligari watch
Die Nibelungen and
Von morgens bis Mitternacht (Edition Filmmuseum), the latter is the single purely expressionist film made during the Weimar years. Arguably add
Das Wachsfigurenkabinett though the US DVD overdoes the tinting a bit.
3)
Hintertreppe and
Scherben as chamber dramas.
Hintertreppe is available in a pretty good copy from Grapevine, for
Scherben you got a link, not many intertitles and a very easy to understand plot. These films have exactly the opposite approach of Lubitsch's films in every conceivable way. The cutting is ultra slow even for the time of its making and the film grammar is also very conservative but effective. The chamber dramas represent a breakthrough of psychology on film compared to lots of trashy writing in the 10s.
4) To complement
Nosferatu watch
Der müde Tod (problematic but serviceable US DVD) and
Faust which show most clearly the heavy influence of the 19th century Romantic period in visual but also narrative terms.
5) For camera mobility add
Der letzte Mann and
Variete (German DVD with English subs) though prepare to suffer from the worst soundtrack ever commited to a silent for the latter film. These films mark the beginning of the late 20s international silent film style which merges the national schools of the previous 10 years and their preferred stylistics into unified visual narratives.
6) For social realism take
Die freudlose Gasse (Edition Filmmuseum) by Pabst and preferably add one of the two Gerhard Lamprecht double features by the same publisher. This realistic strand of German cinema is usually totally forgotten in international histories.
7) For the less commercial fringe
Berlin - Symphonie einer Großstadt (Edition Filmmuseum) is by a wide margin the most famous documentary of the Weimar era, arguably you could add Wunder der Schöpfung from the same DVD publisher to further explore the uniquely German Kulturfilm approach which tried to present scientific facts in myriads of shorts and occassionally features.
The
Berlin DVD also offers Ruttmann's experimental abstract shorts which you have to see together with Hans Richter's and Oskar Fischinger's films which are available on different DVD sets.
8) For mountain films take Der heilige Berg (MoC), Die weiße Hölle vom Piz Palü (Kino) and Das blaue Licht. These films were probably only published because riefenstahl acts in them and directed the last one which is not why you should watch them but because they are the most impressive outdoor features of the first half of the last century. Under extremely diffcult conditions director Arnold fanck created a heavily romantic and mystic approach and created the most germanic genre in film history.
9)
Die Abenteuer des Prinzen Achmed because its the first feature length animation film and still one of the best, painstakingly handmade via paper cuts by Lotte Reiniger.
10)
Die Büchse der Pandora for the late silent fluidity and the miracle of Louise Brooks the leading actress. Also add
Asphalt (MoC),
Abwege https://www.youtube.com/watch?v=waVuoOfguhU" onclick="window.open(this.href);return false; and
Die wunderbare Lüge der Nina Petrowna https://www.youtube.com/watch?v=RnoivyY0JPw" onclick="window.open(this.href);return false; all gorgeous examples for prestige productions with glamorous actresses and lots of visual style.
Until 1930 it's possible to put together a agreeable list if you don't speak German and have only access to commercial DVDs and Internet sources like Youtube. For the remainder the lack of subtitles commercial copies is extremely problematic which is all the more regrettable because the years 1930-33 are arguably the best in German film history, not even classics like
Liebelei are easily available with English subs. many possible recommendations would therefore only be available via underground internet channels or film collectors, maybe something appears on Youtube.
11) Late German realism spreads out in many interesting ways. Only
Menschen am Sonntag is however available as a Criterion, films like
Jenseits der Straße,
Mutter Krausens Fahrt ins Glück and
Abschied are all very interesting for their flashier approach to realism, but not easily available.
12) Serious dramas are represented at least on Youtube with English subs via Pabst's anti-war film
Westfront 1918 https://www.youtube.com/watch?v=s7tY4WaWZzA" onclick="window.open(this.href);return false; and Sagan's
Mädchen in Uniform https://www.youtube.com/watch?v=0Bj1Z5Pd7vc" onclick="window.open(this.href);return false; . I'm not a big fan
Die Dreigroschenoper but it's a Criterion and it's at the very least significant and a musical classic.
13) With this box
http://www.buecher.de/shop/komoedie/deu ... /30548030/" onclick="window.open(this.href);return false; you get ten films with English subs and for Weimar it's especially important for the early sound operettas
Die Drei von der Tankstelle and
Der Kongreß tanzt. The sound operettas are crucial for early sound experiments and far more advanced than their American counterparts save for the films of Lubitsch and Mamoulian's
Love me Tonight.
Tankstelle has very nice ideas and extremely iconic songs though it's rather roughly written and directed,
Kongreß is the iconic Viennese with a much higher polish and a mixture of irony and unrestrained cliches. You also get
Der blaue Engel with Marlene Dietrich though the film was restored once more in the meantime.
14) To round off this highly incomplete look at the sound films, BFI nicely released
Emil und die Detektive, a children's classic with lots of visual ideas and a swiftly moving story.