Errores

It's hard to grasp why Dunn risks the fight on the roller coaster with Ward. The probability is high that an ordinary guy will lose a fight against a hardened gangster and murderer. And that it ends with him being either shot or thrown off. More clever to wait downstairs. Ward has, by his idiotic move on the roller coaster, practically no chance to escape arrest when the thing stops again. The case would have been correctly closed with a living perpetrator. Ward would most likely have been put on the chair anyway, cop murderer that he is.

It is quite incomprehensible why Ward gets on the roller coaster. Gives the police and Dunn time to arrive on the scene. If he had gotten out alive, they would have had him served on a platter.

The frame is ludicrous. Ward kills Davenport, and only the denied alibi is supposed to convict Dunn of the murder (motive ?). And sure, the hot car racket, the under-boss Ward, the overlord Markel, together with their workshop would then be off the hook - ? You know, it was only a lone wolf cop on their trail, who probably didn't pass on any information about his findings to his colleagues. What ? Besides, the denial by the girl stands on very shaky ground. Conclusion: no intelligent criminals at work.