Corrected entry: In this episode it is said that Mr. Feeny missed a day in 1961, but in "I Dream of Feeny", it is said that he has never missed a day.
Corrected entry: When Shawn is reading Mr. Feeny's diary, he says that Mr. Feeny called in sick to his class in 1961 to go to the cabin. However, in Seven The Hard Way, at Feeny's retirement party, it says: MR. FEENY BELOVED TEACHER 1964-2006. 1961 is three years before '64.
Correction: In "Seven The Hard Way" Mr. Feeny's retirement party was an imaginary thought. It's not likely everything would be correct in an imaginary thought.
Correction: In "I Dream of Feeny" Shawn said "I hear he hasn't missed a day since WWI" That was not a literal statement considering the fact that Mr. Feeny couldn't have been in school during WWI and Shawn couldn't know if he missed in 1961 because he wasn't born yet. It was just a joke.