Does anyone have any tips for the skip in stage 1, at Hillcrest Park? I can pass the barrier but can never end up finding the door. The closest I've got is accidently going into Wallace's secret shop instead.

My trick to doing it is once you get through the barrier, move close to the bottom of the screen, then run right until you see the screen move down and then back up, meaning you're at the last screen (The snowy section where the final door is). Once that happens, move to the top of the screen, then continue right. If you did it right, you'll hear the sound of the door opening as you pass by it. Once you do, slowly walk back until you hear it open again, then stop and move up, entering the door. I'm sure there's other ways to do it, but that's the most reliable method I've used. It helps to visualize the map in your head as you do it. Let me know if you need more clarification. I can always make a video guide for it.