When Henry "flies," he lands on the floor face down. When Ray helps him up, Henry is face up.
When Henry exits the booth, the bee (animated) flies out but Henry keeps looking back at the booth as if he sees it there.
To restore Henry's superpower, Schwoz says he must release the ribo-nucleic gas at the precise moment that the bee stings Henry; however, Schwoz does NOT release the gas until after the bee stings Henry and flies away.