According to Laura Ellis (who performed the songs 'Kat's Song' and 'House on Fire' for the game). Guillaume Provost contacted her to be a part of the game after he tried to get the rights to a Julie London song for the game's trailer.
Contributed by CLXcool
In Vincenzo's workshop in the museum area, there are several references to classic Sci-fi.
• A Boba Fett bobble-head and Darth Vader's lightsaber from Star Wars.
• T100's arm from the Terminator series.
• The warp core of the NCC 1701-D Enterprise from Star Trek: The Next Generation.
• Doc Brown's mock-up of Hill Valley from Back to the Future.
Contributed by DrakeVagabond
In the projection room of the theater, a bar of pink soap labelled "Jack" can be found. This is a reference to the film "Fight Club", in which the narrator would often refer to himself as Jack and makes a profitable business in selling soap.
Contributed by DrakeVagabond
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In the level "The Usual Suspects", a blue phone box can be found close to the theatre outside of the level bounds. This is a possible reference to the TARDIS from Doctor Who.
Contributed by Dazz