Garth Algar: Uhm, Wayne? What do you do if every time you see this one incredible woman, you think you're gonna hurl?
Wayne Campbell: I say hurl. If you blow chunks and she comes back, she's yours. But if you spew and she bolts, then it was never meant to be.
At the end of the movie when everyone is in Wayne's basement, we see Benjamin painfully walk up to Wayne's house for each ending in the dark. When the scene changes to Wayne's basement for the first ending, you can see through the basement window directly behind them that it's broad daylight. This is especially easy to see when the equipment starts to spark.