Plot hole: After his mother's death, Peter sets a camera up outside her therapist's office, so he can see who goes in and who comes out; he thinks his mother's killer might be one of the doctor's patients - a tall woman with long blonde hair. All he sees is people going in and people coming out, and then he sees her - the tall blonde. Problem: He never saw her going in, only going out, which is critical, because the killer is the therapist - a tall man - wearing a long blonde wig and make-up. Of course no-one says anything about "We never saw her going in, only out, so it must be the therapist!"
Plot hole: The six-year-old girl (who actually looks a few years older) apparently had seen and remembered a tattoo on the robber's hand well enough to be able to relate the details of it to Meredith, who is then able to visually identify the tattoo on the robber's hand in a strip joint. Not really credible - especially as the woodpecker costumes covered up pretty well the entire body! (Also, the robbers were constantly moving, making visual inspection even more difficult).
