what i liked- the opening with brian being taken away from his mother, the guy remembering Brian when he mentioned he was the dog who could talk, Brian and Stewie burying Brian's mother, the guy on the train who only spoke two sentences in english and then only speaking Spanish, the entirety of Peter/Lois' plot, the ending of the episode, amongst other things.
The only thing I did not like was Chris saying "Guess what word I'm thinking of" and it being "kitty" after he said it was not going to be. I mean, what? What's the joke? That he's easily entertained? That he lies and finds it funny? I did not find that funny, and i thought it coming back at the end was kind of stupid. However that's a nitpick and the rest of the episode is fine. A+