When Mikal first gets into Eugene's car she rolls down the window. In the very next scene when they drive away the window is up.
After Mikal and Zia sleep together on the beach, just before they wake up from the shouts of Kneller, Mikal is barefoot. In the next scene, still sleeping, she has red shoes on her feet.
Approximately 44 minutes into the movie, when Zia first encounters the note written by Desiree, she writes the letter "I" in cursive, when he goes outside to show it to his two friends, the letter "I" in the note is shown again in print.
When the Messiah's miracle ceremony begins, Desiree raises her cane in her left hand twice between shots.
When Eugene's younger brother is threatening to hang himself at age 10, the jump rope around his neck constantly changes positions during the scene, between cuts.
Pouring a beer on electric guitar strings, even with the amp turned on, would be very unlikely to cause electrocution. There is no high voltage current on the guitar itself; about the only way to get electrocuted on stage is through faulty grounding in the sound system and stage set-up, and that would kill you, beer or no beer!