As Dr. Reed walks toward the house to thin the paint he removes his gloves and tosses them to the ground and is opening the paint thinner can with his bare hands. In the next cut, viewed from the house, he is opening the same can with his gloves on and when told to come to the phone he removes his gloves, and tosses them on the ground a second time.
In an early scene when Dr. Reed (Richard Widmark) is shown painting with his son, he flicks excess paint off the brush, and then sits on the same spot where the paint would have landed, but when he gets up there's no paint on his pants.
Offering $50 to men desperate for work for any information about a man (Kolchak) would get all of them to volunteer false info just to get the $50. Implausible.