Skips

• Character Selection Skip 1: In the Roman Forum level in Italy, you can skip a large water section by jumping towards and then wall-hugging next to the pole in the water to get onto a gondola, then jump to the next gondola and then onto the railing, which saves a bit of time because you don't need to switch to Gloria or Alex to get over the water. [found by gourmet529]

• Character Selection Skip 2: Similar to the first one, this one skips changing to Alex or Gloria to get over a water section. Marty's AIR DASH is required. In the South Bank level in England, in some missions you need to go down to a platform on the right end of the river, for example for the third poster in the South Bank posters mission. To get back up, you need to cross the water section using either Gloria, or both Alex and then Gloria. Instead of doing that, what you want to do is go to the back wall, then run to the left and jump off the edge, performing an AIR DASH and landing on a boat which is pretty much in the middle of the water section. Then you can AIR DASH onto the bridge, which is a bit harder to perform, as you need to "bonk" against the wall and keep steering forward until you're on the bridge, otherwise you will slide right off. [found by gourmet529]

• Character Selection Skip 3: All sections that "require" you to switch to Gloria to push/pull around a wooden crate can be skipped by either just precisely jumping as any character or by using Marty's AIR DASH and/or jumping off enemies. Many (not all) tightropes outside of the Practice/Performance levels can be skipped with the same techniques. [found by gourmet529]

• Cutscene Skip: This skip is currently only known to work in the Cannon levels of any country in both Practice and Performance. Marty's AIR DASH is required. To perform this skip, you need to AIR DASH through the loading zone that ends the stage and land on the floor. This skips the winning cutscene of each of Marty's stages, as landing on the floor kills you after you finished the stage (which would otherwise be impossible), respawning you at the start of the next stage, as your new respawn point is set when you finish the previous one. This would work in Trapeze, Tightrope, Motorcycle and Flaming Rings, if there was a way to go through the loading zone without the AIR DASH. [found by BloonKart]