Revealing mistake: Jigen is checking out a magazine after Lupin accepted the mission from Brozzi. The article under the picture is a real article (including real names) that talks about a different kind of story (high level corruption and permits), even if at least it is about Mafia, which fits the episode's theme. (00:09:50)
The Marriage of Lupin III - S1-E1
Revealing mistake: When the camera pans through some of the gossip columns involving the socialite bride of Lupin, the text is entirely in Latin (probably Lorem Ipsum filler). Obviously no Italian gossip magazine, or any mainstream magazine, is written in Latin. (00:04:20)
Revealing mistake: The fireworks explosions lack any depth and perspective, and are superimposed in a way that puts them completely out of place, in particular in the panning shot of the hotel veranda after the crown prince hightails. (00:17:50)
Revealing mistake: When Lupin shows the Mondini file to Jigen, the text is mere Lorem Ipsum filler. (00:10:40)