Simon's birthday cake is a repurposed wedding cake decorated with the message 'Good Luck Julia & Kiefer'. This is a reference to Julia Roberts and Kiefer Sutherland, who broke off their engagement to one another in 1991.
Mr. Wilson is clearly based on Max Headroom (1987), a late 1980s TV series which featured a computerized version of a TV reporter.
The slogan posted on either side of the ATM, "ain't it good to know that you've got a friend," is a lyric from a James Taylor song, "You've Got a Friend."
Mr. Wilson's gradual regression to its non-self-aware state, as cash is fed into the ATM, is a reference to the HAL 9000 computer's similar behavior in 2001: A Space Odyssey (1968) as its memory chips are removed.