Originally, there was not going to be voice acting and there would be six playable characters at the start. Apart from Bernard, Hoagie and Laverne, there would also be Razor (the female musician from
Maniac Mansion (1987)), Moonglow (a short character in baggy clothes) and Chester (a beat poet). Because of design issues and memory limitations, Moonglow and Razor were omitted early on, while Chester became the basis for the twins Jed and Ned Edison. When
Myst (1993) came out, it popularized voice acting in games, and when the game's original deadline could not be met, the creative team decided to make use of the extra development time to make Day of the Tentacle their first "talkie game". The disk version only had voice acting in the introduction, while the CD-ROM version had talking throughout the game.