Background CGI
Most films these days have CGI in the background and it is so seamless that only people familiar with the actual location can notice it. There was one scene, just prior to the final showdown, where they showed Bill on his bike in front of the white tower previously seen on the postcard. Did anyone else think that was some SyFy level awful CGI? I mean, did they even need it? Why didn't they just cut that short scene?
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