When Monica is walking the stroller in the rain, Rosie, the baby, is an obvious doll, when viewed from the distance shot. Close-up is obviously a real child.
When Sam is tracking down the babies who will be exactly 6 months old within the week, one of the birth certificates he jots down the info of is that of Mary Ann Liu, and the certificate says she was born in 1998, which would make her about to turn 8 years old, not 6 months.
The road sign for Salvation misspells lotto as "loto jackpot". While this is true that the word "lotto" is misspelled, it's not a revealing mistake unless the reveal is that someone can't spell "lotto".