Some ideas from my view:
Cricket Cage: Take the videotape, douse it in gasoline, and light it on fire.
Kamehameha: A simple one. If Robbie goes straight to the Observatory from the Pit (the door opened when Tina spun the sundial)
, he has himself a solo win.Henry VIII: Shay starting in the Gargoyles instead of the Cave (provided the team wouldn't be forced into the Cave from there) would at the very least have prevented a triple seizure. Winning could still be tricky given that Shay would've been taken out one room away under this scenario.
Lucky Pig: Reverse order of players (duh

) and start in the Cave of Sighs instead of the Gargoyle Room. Other than the Room of Harmonic Convergence, where the Pig was, the Cave of Sighs and Heart Room were the only rooms that Kristen didn't enter. The Gargoyle Room had a guard, so I highly doubt the Cave of Sighs would have had one, too. So unless the team would have have been forced into the Gargoyles from the Cave, this would make it a solo win.
Blackbeard: Reverse order of players (duh

). There's no way James would've been as incompetent as Sabrina. Right?
Lost Fountain of Youth: Same as Lucky Pig, though the start point change is for a different reason. The placement of the guards basically forced them to encounter all three to have a prayer at winning.
Secret Battle Plan: Inform the judges that Olmec said nothing about the pieces in the "Attack Philadelphia" temple game having to be oriented the right way, thereby preventing the Silver Snakes from being screwed out of the full pair of pendants (and in turn preventing a triple capture, though Cristina finding the plainly visible half pendant, which James had earlier signaled to her, would've taken care of that, too).
Lost Lion Tail: Keep the Silver Snakes from knocking over their sign in the third temple game, thereby preventing the Purple Parrots from making it to the temple in the first place.
Dolley Madison: Another simple one. If Matt starts in the Crypt instead of the Ledges, he has himself a solo win.
Marble Armrest: Make the writers put some effort into the tiebreaker question, so the least deserving team doesn't make it to the temple on the easiest tiebreaker of all time.