"S&Ls are unkillable! Ever see It's A Wonderful Life? Even that Bailey bastard couldn't screw it up!"
Peanut's explanation (in Japanese) that it's considered customary in American culture to blow something up once a business deal has concluded. And then he fires a bazooka at Phil, leading to the above-mentioned dislocation.
The episode "The Devlin Made Me Do It", through and through, comedy gold. Especially Devlin's constant crashes and amusing injuries.
Also of note, the And Knowing Is Half the Battle message on one of Devlin's tapes that Harvey was using for evidence is ruined by Deviln himself pointing out how riding without a helmet(the exact thing the PSA is trying to tell kids not to do) is cool, talking about using a condom and hitting on the young girl in the video.... which leads to Harvey frantically trying to stop the tape while blocking the screen.
Devlin's how-to tapes, culminating with "How to Jump Over a Ravine On a Bicycle Comma Bobby".
When Reducto has one of the members of Shoyu Weenie on the stand, she answers his question in a slow, breathy voice in Japanese. Pretty much every man in the courtroom turns to her with a shocked and/or aroused look on their faces and dropped jaws, including a guy carving a wood statue with a chainsaw and a clown making a balloon animal. It helps that the translation of what she was saying is roughly "My name is Seiko, I like that song, it's a pretty song."
The Teaser for "Shaggy Busted", where a (live-action) cop pulls over Shaggy and Scooby.
The live-action interrogation clip from "Death by Chocolate", where a pair of cops get aggressive at a man in a Boo-Boo costume.
In "SPF", Harvey gets paranoid of the sun and wears protective coverings, telling Peanut that the sun can kill him. Peanut responds by quoting a parody of the NRA slogan "People with suns kill people" whilst polishing a gun pointing right at him.
The cut to an old 1960s clip of Birdman receiving his powers from the sunlight, which delves into an orgasmic reaction.
Harvey complaining about Potamus parking his blimp/arc across two spaces, followed by him shouting "Hippo!" at Potamus, after which a sex doll pokes out of his trunk.
Mentok's battle with Shadow the Brain Thief in "Harvey's Civvy." During the trial, Mentok gets so fed up with Shado's ripoff of his power, that they veer off into a sort of wizard's duel, trying to out-do each other. This troper lost it when Mentok began making the stone-faced security guard do a Russian dance.
"Blackwatch Plaid," fullstop—the episode where Secret Squirrel is being sued for flashing. Half due to the hilarious use of the character Secret Squirrel, and half due to Phil Sebben's hidden camera footage showing Harvey and his co-workers in live action (including footage of live-action Harvey frolicking around Atlanta and the Turner Mansion's front lawn), and climaxing with the combination of these two plot lines.