After Steve sneaks out of Mr. Grayson's piping-hot shower, the smoke pouring from Steve's clothing (meant to denote the extreme heat of the water) continues for much longer than would be natural.
When Isobel is trying to hide Steve in her room after he escapes from her husband's shower, a large shadow of the boom microphone can be seen on the curtains in front of the large windows out to the patio.