This was a hilarious episode! Although it was really predictable that we would eventually find out that everyone hit Sammy on the head at one point or another, it was funny to see the way it happened.
I was probably as happy as Jimmy that Logan could read before Sammy could. Kim and Greg think they are such superior parents to Jimmy and Christine! It was nice to see Logan actually be smarter (or at least develop earlier) than Sammy.
Greg pretending Sammy could read was funny. It was so typical of him to sound out the words for Sammy and consider that to be him reading.