List of references to pop culture

Phineas and Ferb references pop culture several times throughout the series. Please note the list is for those referenced more than once.

SpongeBob SquarePants
Perfect Chemistry       When Squidward sees SpongeBob's parts inside the Krusty Krab, his actions are very similar to what Candace does to Linda, such as trying to show Mr. Krabs the parts, which are missing.

Reverse references
Instances where Phineas and Ferb is mentioned in other media should be listed here.