Revealing mistake: When Claude and Ray are at the retirement home getting ready for bed, as Ray lifts up his shirt you will see where it looks like he's wearing a fat suit underneath. He can also be seen pulling it down to his waist.
Revealing mistake: In the scene where Claude and Ray are arguing about the loss of the appeal and Ray calls Claude "soft", watch as Claude swings the first punch of the fight, his fist misses Ray's face. This is even more obvious in slow motion.
Answer: Being dead, they would have to get new I.D.s and social security numbers. Being elderly, they'd grift themselves to the proper agencies about being denied their benefits: elderly, disability and pension from the "companies" they worked for.