Captain America (1979) - Self Repairing Exhaust
Captain America climbs up on a moving semi. Looking through a vent into the trailer/container, he sees the main bad guy & an intercom. Cap then reaches up & uses his super strength to bend the truck's upright exhaust pipe into the vent. However, in every camera shot after that from the front of the truck, the exhaust pipes are clearly seen perfectly upright & undamaged.