Visible crew/equipment: When Mrs. Doubtfire is cooking in the kitchen, sets her fake breasts on fire, then hits them with the pan lids to put them out, you can see the camera crew in the reflection of one of the pan lids.
Visible crew/equipment: In the scene where Mrs. Doubtfire and the kids are on a trolley, as the trolley passes you can see the crew in the trolley window.
Visible crew/equipment: When Daniel is having a spaghetti dinner with Chris, Lydia and Natalie in his flat, you can see the equipment crew reflected in the picture frame before we see the family eating.
Answer: To get rid of the smell of alcohol, although it's pretty obvious Mrs Doubtfire is drunk anyway.
Sam Johnson