When the gang falls asleep, Chase lies on a chair. Once Michael wakes up from his phone ringing, Chase can be seen lying on the floor. Then when Michael wakes up everyone, Chase is back on the chair.
Worms don't live on beaches.
When the gang is walking along the beach to see if they see anybody, the beach is on their left. Previously, Dustin said Mystic Beach was south of where they were trying to get to. Anywhere along the Pacific if the beach is on your left, you would be heading north, opposite of where they were trying to go.
Having all the kids ride on the back of Mr. Bender's truck would be both dangerous and illegal.
Since Quinn knew the chemical she made smells like coconut, she should already know that it would induce drowsiness.