When Sonny calls Chad, he picks up his phone before it starts to ring.
Zora and Nico were in Marshall's office when they got caught. Zora went to tell Sonny, but Nico was already back at the prom.
When Sonny goes in the costume room, she says she only has the two dresses from "Princess Girl" and "Mermaid Girl" to wear. But in the episode You've Got Fan Mail, they did a sketch (So You Think You Can PP Dance?) where Sonny is the host and she is wearing a blue dress. But the dress is not mentioned when Tawni and Sonny talk.