*Spoilers* 2 clever ways to beat two of the traps
I don't know if I'm first with these ideas or if they are covered elsewhere but:
1. Valentina could have used her free leg to hold her sawed leg in place and then extracted the bone marrow from the severed portion of leg.
2. Mateo could have tried to do a keyhole surgery on his liver instead and placed the piece of liver in the enzyme tank.
I don't know if Jigsaw or Amanda would have interrupted these attempts but they seem like they would have been superior ways to go.