I'll Be Waving As You Drive Away (1) - S4-E21
Factual error: This episode takes place just after Grace was born (1877). Mary would have been 12 during this time frame, but she is portraying a 15-year-old.
Little House on the Prairie (1974)
1 factual error in I'll Be Waving As You Drive Away (1) - chronological order
Welcome To Olesonville - S9-E3
Continuity mistake: Mrs Olsen cleans up the old Hansen house to sell, however it was made the blind school years back and burned down, killing Mary's baby and Alice Garvey.
Laura: I hate that Nellie Oleson.
Caroline: Laura! Don't say "hate" - don't even think "hate"! I'm sure Nellie has her good qualities somewhere.
Charles: Your ma's right, half-pint. Now on the way home, we'll try and think of some.
The Voice of Tinker Jones - S1-E11
Trivia: Sean Penn is in this episode, albeit with no lines, always wearing the same blue shirt. His father directed this episode.