Hi again! I was playing around
this glitch, and came up with a bunch of conclusions.
1. ALWAYS use the challenge marker near the pizza parlor, as doing pizza missions revert you back to spiderman!
2. This glitch can also work like this: Start a mission that has a blue checkpoint. Noclip into the daily bugle, and attempt to start a bugle mission. The cutscene would play, but you won't get the mission. Do this several times, then exit the building and complete the blue checkpoint objective. There's a random chance afterwards that you get forced into an challenge while swinging around.
3. The dodging minigame in the arcade works well using parker. Exiting a minigame also brings people back to the map.
4. Purple crime missions can happen while playing as parker in an empty map.
5. Parker can die too from criminals and falling.
6. DON'T fall into the water; you'll get stuck in an infinite loop
7. Dying also reverts you back to spiderman
8. If you somehow managed to "force" parker as spiderman, like for example, doing this glitch and then try to complete the art gallery robbery mission, you'll revert to spiderman WITHOUT powers except for dodging bullets.
9. You CAN complete missions by luring enemies into water.
10. You can start challenges as parker.
11. You can go to another chapter as parker
12. Noclip into the daily bugle, then wait for the chapter intro to appear. It will not pause the game within the bugle.
The 2nd outcome is important as it may potentially trigger story events. I'm still trying, however, to trigger things other than challenges.
Edit: The earliest chapter you can do conclusion 2 is 5. Also, it seems to give different results depending on how many times you've talked to robbie to get a bugle mission, and whether or not you skipped the dialogue.