Continuity mistake: When Doogie goes into his en-suite bathroom to shower, he takes off his dressing gown completely before pulling back the shower curtain to get in, at which point he gets temporarily blinded by a fan taking a photo of him with a camera. A few seconds later, he's shown putting his dressing gown back on, even though there wasn't enough time for him to have picked it back off the floor and start redressing.
Doogie Howser, M.D. (1989)
1 mistake in season 2
