In the episode "Invention Convention", when Brackenreid is going to the dentist, actually physically being coerced by his wife of all things, Crabtree comes by, gives him the report of the status of the case, then runs off with the apple Brackenreid was gonna have as a reward. Later comes the Call Back from Brackenreid as he thanks Crabtree for him giving the report and running away from the dentist.
In the episode "Who Killed the Electric Carriage?", Inspector Brackenreid finds out that his wife (who's been giving him a hard time about his drinking) and other ladies from bloody Temperance League participate in bloody gambling, so he orders Constable Crabtree to arrest everybody in the bloody den. The following exchange has perfect comedic timing and is complete with hilariously ominous music.