Continuity mistake: Tim breaks and knocks the crane that Al built off the table. The shot changes and part of the crane is back on the table.
Home Improvement (1991)
1 mistake in Don't Tell Momma - chronological order
Al: Say, do you think they call it a nail gun because it shoots nails?
More trivia for Home Improvement
Question: Virtualy all of the tools that Tim and Al show on Tool Time are the Binford 6100 but obviously different tools each time,was there a joke regarding the number 6100?
Answer: In seasons 1 and 2, each Binford tool had a unique model number, but from season 3 onward, they were all numbered 6100 as a running gag.
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