Wilma's hair color alternates between dark blonde and brunette throughout the episode.
The framed picture of Jennifer would never have survived Buck's 500 year frozen suspension in space intact.
The last line, Twiki going "just when you thought it was safe in the 25th Century" actually refers to "Just when you thought it was safe to go back in the water," the tag line of Jaws 2 (1978), not Jaws (1975).