Wikipedia: The series was produced as a daily show. The economic and time pressures of producing 130 episodes in a single season (seven shows were filmed every five days) meant cheap, wobbly sets, no outdoor filming, a laugh track instead of a live studio audience, the use of single takes, the reuse of 25-year-old radio scripts, and other shortcuts that resulted in a poor-quality show.
Even flubbed lines and bloopers sometimes ended up airing, because the show could not afford retakes.
Noticed a couple of things in the video above
Tracy (7.00) After I raced him I was thirsty, so he got me a glass of water and just as I was going to take it from his paw (not hoof)
At 8:24 there is a guy's head at the bottom right of the picture