The church used when Rachel goes to a service to hear Mercedes sing has a totally different interior from that in "Grilled Cheesus," when Kurt goes to church with Mercedes.
In the pilot, Finn is wearing a sweaty T-shirt with the sleeves torn off when he wheels Artie home after rescuing him from the Porta Potty. The actor portraying Finn in a similar shot here (and whose face is not shown) is wearing a letterman's jacket.
In Kurt's conversation with Mercedes at The Lima Bean, he says Finn has quit glee club twice, but later, at the meeting in the choir room, Kurt says Finn has quit once.