During the debut battle of the Rescue Zords, there's a bit where just the legs and pelvis of the Megazord walk up to cool some lava into rock to let them get at a burning building. Walking pants are funny, giant robot walking pants are hilarious.
The ending of "The Last Ranger", where Joel tries faking amnesia to get out of a strict training course. It backfires when Miss Fairweather calls his bluff.
For that matter, the continued failed attempts for Joel to get a date with Doctor Fairwether. In "Rising from the Ashes", Joel saves her life, and she invites him to dinner. However, she invited all the other rangers too. They all burst out laughing at Joel in his dress outfit.
Just after Joel's first struck out with Miss Fairweather, having pissed her off good by unintentionally insulting her for trying to tell him how to fly his zord, he turns around to see the others were watching him. They then proceed to taunt him by gesturing a crashing plane. What a team.
During "The Fate of Lightspeed part 1", in the middle of a very dark moment when the Rangers are trapped and Jinxer and the Batlings have taken over the Omega Megazord, cut to Jinxer sitting in the cockpit pressing random buttons while saying "I've wanted to fly one of these things since I was a kid."