I don't remember bars being on these windows.
3 seconds sound clip from the Back to the Future Part II movie soundboard.
You can hear this line at 00:39:48.944 in the Blu-ray version of the movie.
Quote context
[...]
- How long do you think she's gonna be out?
- You better bring smelling salts back with you.
- All right. Come on. Let's go, Einie.
- Don't worry. She'll be fine.
- I don't remember bars being on these windows.
- If you need me, I'll be back at my lab dismantling this thing.
- Right.
- Hey. Hey, wait. Wait a minute. What are you doing in my room?
[...]