Frequent Continuity Errors. Due to the 'out of sequence' way they were making the show, there's sometimes evidence that scenes in any episode were filmed months apart and edited together, looking like it's set in a very short time.
In some episodes the front door had a striker/latch, in others there wasn't even a cut-out for it.
The characters mispronounce the Indiana city name Terre Haute as "Terra Hut." It is pronounced "Terra Hote."
The childrens' names are listed as Patterson-Davis. This is not possible. Their father was Bill's brother. Therefore their last name would have been Davis from the start.