The crowd voices during the disk battle in the beginning of the movie are actually the voices of the audience during the panel for the film at the 2010 San Diego Comic-Con. The audience was instructed to stomp and chant to prompts shown on the large video screen, and the sound was recorded by techs from Skywalker Sound.
In an interview, Jeff Bridges noted that as he was being scanned by laser into a computer (for CGI effects), he realized the same thing happened to him (fictionally) in the original Tron (1982).
Early drafts of the script did not feature the role of Alan Bradley. It was only after public outcry by Bruce Boxleitner and fans of the original film that Bradley was added to the script. Boxleitner's performance proved so popular, he went on to make public appearances as Alan Bradley to promote the film, and returned to play the role of Tron in Tron: Uprising (2012).
Shooting the film lasted only 64 days. Post-production, due to the heavy special effects, required 68 weeks.
Daft Punk were huge fans of the original film and readily agreed to be the composers. Director Joseph Kosinski said he was interviewing them about the job, he felt that he was the one being interviewed, such was their desire to make sure he preserved the spirit of the first movie.
Daft Punk: In addition to the soundtrack, the duo are spinning the tunes at the End of Line Club with their trademark helmets.
Steven Lisberger: producer of the film and director of the original Tron (1982) as the End of Line Club bartender.
Cillian Murphy: Uncredited, as Edward Dillinger Jr., the head of ENCOM's software design team, and the son of former ENCOM Senior Executive Ed Dillinger, portrayed by David Warner in Tron (1982).