I've found a glitch on the coal area on the first level
Added 18 Aug 2013, ID #5575
If player 1 picks up player 2 and presses b while walking into the lava, player 1 will lose half it's health and go flying into the air , while player 2 will only lose half of it's health, but will not take any further damage from the coal pit that player 1 tossed them into.
I've found a glitch for the coal-parkour bit of the train rescue
Added 18 Aug 2013, ID #5574
If player 1 picks up player 2 and walks into the lava, player 1 will go flying into the air and lose half their health, while player 2 will only be on half health and will be able to walk in the coal until you press a.
Note: If this doesn't work, try pressing b on player 1's remote right before you fall into lava