alc24

“ 1. What turns people on to/about her is her way of dressing, other than that/apart from that, she's banal.  You should replace the comma splice with a full stop.

"Other than / apart from" are both okay.

Re "to/about":  "About" works well in this situation.  I also hear "to," but I'm hard pressed at the moment to explain it.  There's a different meaning for it, akin to "that's what set me on to her"   -    that is, what put me on her trail, as in an investigation.

Also, turning someone on has erotic connotations which don't seem to apply in this case. It's more of a one-on-one thing, rather than "she turns people on."  That is, "People think she's sexy" is different from "She turns me on."

2 Is this one of these movies that have music playing in the background the whole time/with music playing in the background the whole time.  Both versions are common (and idiomatic) and require question marks.  ”