Savannah missed the whole look...and even if she had seen it, she very likely would not have been able to interpret it.
"We didn't need the passkey," Savannah said brightly. "The door was totally open, so..." She lifted her shoulders in a shrug.
In the case of the janitorial closet, that was one hundred percent true. And since that's what she thought they were talking about, it came out quite sincerely.