Barney says he lives at 224 Rocky Way, but it has already been established that his next door neighbor Fred lives at 301 Cobblestone Way.
The sign on the building where Fred goes to have his eyes examined says Optician. Optometrists examine eyes, not opticians.
When Barney is driving Betty and Wilma to the circus, Barney's and Betty's hair are blowing in the breeze, but Wilma's isn't moving at all.