Before Phineas sings the line "Man, is this ride sweet or what?" he throws his guitar off the rollercoaster, but at the end of the song, he has it back.
When Isabella is looking at the seatbelt falling, she looks to the right; in the next scene, she turns from the left.
When they go to space it swaps between the new characters in the rollercoaster and the old ones from the first episode as old clips are used and the old group can be seen in the rollercoaster in multiple shots.
When the characters are getting out of the tree the characters from the old episode get out even though they weren't in the rollercoaster in the musical version.
In "Mom Look", Candace says Phineas and Ferb built the time machine, but they only fixed it.
At the end of "Mom Look", Candace said Phineas and Ferb "built a rollercoaster twice." However, they also built rollercoasters in "Fireside Girl Jamboree" and "Phineas and Ferb-Busters!".
In "Carpe Diem", when they sing "There's no such thing as just an ordinary day," Isabella's voice can be heard singing along, but when she comes in later on, her mouth is closed.
In the line "Corkscrewing 'round the interstate," the screen is rotating the wrong way, giving the impression they're going up the corkscrew backwards.
In "Carpe Diem" when the Fireside Girls appear, they don't move their lips until the second "Ooh".
During "Mom Look", Candace said, "Once they made it winter in June," but in "S'Winter", Phineas says it's July.
The collar of Stacy's dress switches back and forth between tan and purple several times in "You're Going Down".
When Phineas is singing his Spanish line during "Rollercoaster", Isabella and Ginger's necks are attached to the car seat.
At the very end of "You're Going Down", Stacy and Jenny swap eye colors.
During "Rollercoaster", when Phineas is looking at Isabella and Ginger and raising his arm during the first "We go ah, ah, ah," his arm is superimposed over his shirt sleeve for one frame.
When they go to space it swaps between the new characters in the rollercoaster and the old ones from the first episode as old clips are used and the old group can be seen in the rollercoaster in multiple shots.