When Jenna is found holding the gun that killed Naldo, it is clearly a revolver. Naldo even shows it to Jenna prior to entering the hotel room. Yet, when Jenna is on trial, the gun is now a .380 Berretta.
The size and layout of Southfork Ranch cannot possibly hold the number of bedrooms the series suggests it has. When the show first starts, four bedrooms would be needed (one for Miss Ellie and Jock, one for JR and Sue Ellen, one for Bobby and Pam, and one for Lucy). The following year, a nursery is added along with a guest room for John Ross's live-in nurse, totalling six. In later years, Sue Ellen has her own room for a while, and during episodes of the 1984-85 season, there would need to be at least eight bedrooms to accommodate the family and various guests. Additionally, many of the bedrooms have their own bathrooms and walk-in dressing rooms, which cannot possibly match up with the exterior of the house.
When Bobby Ewing returned at the end of season nine it was explained that the entire season was a dream that Pam Ewing. However, there were several references to Bobby's death on Knots Landing (1979) that could not be readily explained away.