Scroll down for a comment on a gag on 2ACV09 I don't think anyone has mentioned. Yet. S P O I L E R
S P A C E Welcome back. Near the end of the show, Leela says to her almost bride after his shape-shifting spree something to the effect of "How come you couldn't change shape where it really counted?" We then see an establishing shot of the Planet Express ship, which flies (somewhat quickly-try and catch it!) past two moons or planets, VERY close in distance to the ship.
Clever-a penis joke after a penis joke!