Lupin III

Until Sunset, the Full Moon - S1-E7

Stupidity: This is not quite 'stupidity' but rather a "movie logic", supposedly sharp deduction that is really just a wild and nonsensical guess. Zenigata knows for a fact that Fujiko is impersonating Elena because she knew right away where to get the first aid kit, while Elena hasn't been in the mountain house since her husband's death. That makes no sense; Zenigata has to assume that Elena was completely straight about that fact (if it was the treasure's hiding place as he suspected, she easily could lie), and a person can easily remember where they store their security items even after years, for a variety of reasons.

Sammo

The Marriage of Lupin III - S1-E1

Factual error: The taxi driver bringing Zenigata to the wedding gives him some background information about his home country, San Marino. In the English dub he says "It's one of the most ancient kingdoms in the world." San Marino is a republic. (00:00:20)

Sammo

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