About 5 mins in, Gabby is talking to fireman Jack, out in the street. An extra wearing a bright royal blue coat and matching knit royal blue beret passes behind the actress in the foreground. The camera cuts to Jack, and the extra can be seen finalizing her passing and exiting screen right. The problem is the camera P.O.V. cuts back to Gabby, and that same female extra is seen again, passing as if the first time, behind Gabby. (The same extra will reappear later in the show, wearing the same bright blue costume.)
In the beginning of the movie, Gabby and Michael come to Angel Falls. They walk on the sidewalk and talk. You can see in the background green leaves on the trees. This happened several times later every time it was shot in that same street (it looks like it was the main street) and at Christmas tree lot. And yet it was supposedly taking place in December, and there was snow on the sidewalk, too. Obviously it was filmed in the late summer/early autumn.
When Gabby is first introduced to the church congregation, Delores can be seen sitting in one of the front pews next to Jack. It is later learned that Delores is estranged from the church and thus should not have been at a church service at this point in the story.
Presumably Gabby is an angel because she has died. "Free Will" is not enough to grant her a second life on earth, despite what she says she wants.