User blog comment:ArtDraw12/Biggest plot holes, goofs, mistakes & inconsistencies in Total Drama series/@comment-28182423-20161106174532/@comment-4742462-20161106181806

Oh, you mean like how according to Harold he was always like that in Island when he wasn't? Because yeah, I'd totally believe someone who wasn't even on the same team as him.

Speaking of which, I've also thought of a few more things to add:

Sierra's Characterization Marches On: By around halfway into World Tour, Sierra using her uber-fan knowledge of the show to her advantage is completely scrapped to focus solely on her Cody obsession and she no longer seems to have any desire to win.

Sugar's antagonism: Because of how she felt more like 80% comic relief and 20% villain, she was easily the most inconsistently written character of the season who couldn't even be taken seriously as a villain most of the time as her "Acts of evil" (which as you said would've happened anyways even if she wasn't there) were overshadowed by the instances of her being an unsophisticated slob. Made worse in episodes like Sky Fall which tried to have her be BOTH!

Dave's Characterization Marches In: Similar to Sierra, his fear of germs disappears after the 7th episode to focus solely on his Sky obsession and he too seems to no longer have any desire to win.