It was originally a funny film, and there is no need to nitpick about some small details to discuss its rationality. But there is a big loophole in the plot that has to be said and cannot be ignored. First of all, after Jackie Chan and Ding Ye fought each other in the interrogation room, Chen Xinjian told Jackie Chan that there was no need for him to find someone else in the case of counterfeit banknotes. It is logical that Lanks, who was played by Feng Cuifan as an undercover agent, was the investigator of the counterfeit money case. But we know that this case has something to do with the people of Wufuxing. During a counterfeit money electronic board transaction, the gangster played by Huosuo happened to see Taibao foolishly holding a suitcase and decided to rob it. And accidentally encountered Jackie Chan in the presence of non-stop pursuit. And in the process of Mars escaping, it happened that Wufuxing's Wubao cleaning vehicle was on its escape route, and coincidentally, Mars's companion fell. The suitcase fell into the Wubao cleaning car. Coincidentally, Taibao and others were tired from chasing and just stopped beside the Wubao cleaning car to catch their breath, and Taibao discovered that the suitcase was in the car that drove away at this time. It was at this time that the five lucky stars were involved in the counterfeit banknote case. Then it can be said that when 4 Fuxing was in prison, it had nothing to do with this case at all, and the police could not have foreseen in advance that after so many coincidences, members of Fuxing would be involved in the case. That is to say, Lanks' undercover agent is simply wasting police force in Lucky Star. There's no reason to go undercover among a bunch of unrelated people. What's more, it's still a senior police officer who goes undercover (from the fact that he has a separate office, it can be seen that he is at least an inspector, and he is also a chief inspector in terms of rank).
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