When Lil goes to say good-bye to Ray, Ray's cast is on his right wrist. A few moments later it appears on his left wrist.
At the beginning of "Saving Sammy", the murdered couple and their two children are named "Harding". By the end of the episode, however, their name has inexplicably changed to "Harris". At one point the detectives even seem to flip-flop back and forth between the two names a few times. I discovered this while watching with the captions turned on; I noticed that each time an actor said "Harding" the captions read "Harris".
Scotty says (after reading up on autism) that autistic people cannot tell lies, which isn't true. There is a wide range on the autism spectrum and many autistic people can lie and show emotion.