Abound. Just to name a few:
- When they're in the "real world" Mack and Brady actually surf. In the "movie" portion, Mack and Tanner are surfing in front of a green screen.
- When the movie, Wet Side Story's, projected on to a screen, or shown on a TV screen, it's shown with a warmer color pallet indicative of older films, pre-2008, that were shot on older film cameras with older film lenses. However, when we're looking into the film universe, it looks more like the world outside the film. Most likely because we're supposed to be seeing the film universe as it was when it was shot, rather than through the remastered film stock it would've gone through in-universe.
- A few plot holes tend to show up, especially towards the middle-end. How did Tanner and Lela find out about Camembert's and Dr. Fusion's evil plan? Of course, 1960s surfing movies had their fair share of plotholes too so it's easy to assume that the actual Wet Side Story likely had the same plotholes as well. Plus, it could be a side effect of the movie essentially trying to catch up with itself once the plot is un-derailed.
- Likewise, this does explain why the plot of Wet Side Story in the first film moves very quickly, why Camembert and Dr. Fusion never return in the sequel despite hinting they would and why there's no explanation about What Wet Side Story becoming Lela, Queen of the Beach could do to the timeline or the very fabric of reality itself.
- The opening theme is set in the present and Autotuned, but the rest of the songs are not because they're from the 60s and Autotune didn't exist yet.
- When in the real world in the second movie, Lela and Tanner can influence the real world, as evidenced by the few songs they have before their friends follow them. Considering their hair still doesn't get wet, and any clothes they wear transform into their 60s equivalents for a while, it can be assumed they still have the movie's magic as a part of their beings until they'd ultimately disappear. It doesn't make as much sense for Mack and Brady when they do the 'Silver Screen' song, but they could possibly be tapping into the bit of residual movie magic they might've gained from being in the movie to perform it.
- 'Silver Screen' make sense in the other direction without movie magic though. The movie magic is gone by that point, as seen Tanner and Lela now being bound by the physics of this world. However immediately before the song, Brady and Mack were trying to convince Lela and Tanner that they are movie characters to no avail. Brady has the idea of illustrating his point “in a language they can understand,” that is, a song. Hence this number is Brady and Mack actually arranging a crew for the song.
