I've noticed that in season 3, the animation keeps switching back and forth between the s1/s2 style and the modern Adventure Time art. Same with the music, some episodes use s1/s2 music and others use modern Adventure Time music
I understand that Conquest of Cuteness is the first episode of season 3 of Adventure Time, but this episode feels like a legit season 2 episode with the animation and music:
The classic Adventure Time atmosphere is still present in this episode, and this is right before it gradually starts to fade away. I also don't feel any nostalgia towards episodes after the classic AT feeling was taken away. Given that season 3 has a similar tone to s1/s2, just slightly darker, I wish they kept the old art style and music for more episodes in this season.
The animation still has bolder lines and brighter colors, just like season 1 and 2. "Memory of a Memory", "Still", "Hitman", "Too Young", "Ghost Princess" are the only other season 3 episodes with classic Adventure Time artwork and background music. Scary how those and episodes like "Dad's Dungeon" are in the same season. I find it frustrating how Spongebob seems to be the only show that most people notice the shift in art, tone, and music.
The season 2 episode of Dexter's Lab "The Morning Stretch" has a greenish tint. Someone must've screwed something up in the dark room. Given the fact that the first two seasons of Dexter's Lab were cel animated, I think all the special effects were done optically.