Best TV mistakes of 1978
Continuity mistake: When Baltar turns to face the two setting suns, we see the lower one at the left has what could be a boat in its reflection on the water. The higher one on the right is over a mountainous area on the horizon. The next shot is of Baltar in close-up, then the next returns to the horizon to show us Baltar's view, which shows just ONE setting sun. The one on the left has vanished though there is room enough for it to have been seen in this shot.
Plot hole: In the first season, Lucy Ewing had an affair with Ray, the farm hand at South Fork. Several years later, it was revealed that Ray was actually Jock Ewing's illegitimate son, making him Lucy's uncle. However, the subject of their affair was never raised, even though they surely would have been at least somewhat traumatized upon learning of the accidental incest.
Continuity mistake: When Roland plays his tape recorder on the coach, the woman on the tape says "lightest lemon sponge I've ever tasted - she used to bake, yes I remember, mind you she worked hard that woman..." But in the cafe Roland didn't start recording until she said "mind you she worked hard..."