As the sergeant is crossing a yard containing a herd of cows running by, on the far right one of the bulls gets sidetracked and stops running and begins mating with a nearby cow as the rest of the herd continues running by. The camera quickly moves away but it is clearly visible for a second or two.
At 44.20 when Tom is sitting in front of the TV, while Cully gets him a drink a person in profile is partially reflected in the nighttime window for several seconds.
At 58:40 as Barnaby is speaking to the Beaverses at the greenhouse, the reflection of a boom can be seen being hoisted away in the glass, top right hand side of the screen.
When May Cuttle is regressed as Gaius Quintus "he" states that it is the year 75AD. BC and AD did not come into use until the 6th century.