In the episode Kirby's Pet Peeve, a robotic dog explodes and "dies". Hour of the WolfWrath also has the titular beast, a canine-esque monster, sliced in half (albeit non-gorily) by Kirby's Sword Beam.
Kirby's robot dog in ep. 15, Kirby's Pet Peeve, was bought from a toy store. The robot dog ends up exploding at the end of the episode, also saving Kirby in the process.
Kirby is implied to only be a baby in the show, and in episode 51 he is shown crying when he thinks his friends don't want him around anymore. This is later revealed to be a misunderstanding, and they still like him
There are a few episodes where people are unintentionally drugged. Kirby accidentally ingests a mushroom extract that causes him to hallucinate, in another episode everyone is hopped up on an energy drink that contains 'cocagine'.
Episode 93 at the end of the episode. Kirby is placed in a coffin and buried in order to get back at Dedede for a cruel prank. Kirby is unharmed and pops out of the ground.
One episode revolves around addictive potato chips, and Kirby and Dedede are shown as exaggeratedly fat, to the point of being unable to stand or walk, and this is played for comedy.