Other mistake: In the beginning scene where Dog is in his apartment, the TV screen is always reflected in the rightmost window, but this is impossible as the TV is too far to the left of the window for it to be reflected. (00:02:06 - 00:04:10)
Continuity mistake: In the beginning scene where Dog is in his apartment, the Pong game cartridge in his Atari 2600 sometimes disappears and reappears. (00:02:20 - 00:03:14)