Louis is seen reading in bed. It's the play, Parfumerie, which You've Got Mail is based off of.
You can't "contract" shingles as an adult. One of two things could happen. You could either get chickenpox when you were younger, the virus would remain in your body, and later it could come back as shingles. Or if you never had the chickenpox before: an adult with shingles could infect you with the virus, but you would first get chickenpox and not shingles.
Toward the end of the episode when Jessica turns the steering wheel to the right to diagonal park, you can hear her hands slide over the steering wheel because it does not actually turn.
Evan and Sicily are having fun correcting each other's grammar. Sicily says "you and me" when she should have said "you and I". When Evan good-naturedly corrects her, she says, "I don't know what came over me." Evan responds, "It's OK. You didn't mean to." Sicily shoots back, "Ending a sentence in a preposition!" and they both laugh. Evan's "to" was not a preposition. It was the first part of an understood verb infinitive, something like, "[You didn't mean to] end the sentence that way," or ". . . to make that mistake."
The first transition shot of the school's message board ironically misspells "speling bee".