When Maribel starts crying while helping to put the necklace back on her father, her tears are clearly evident, but in the next shot, her eyes are dry.
When Ray's boss holds up the newspaper it reads "Super [superintendent] Stabbed", but in the next shot, the paper on the desk clearly reads "Super Slain".
When Ray and Ann are at his place for dessert, we see him coming out of the kitchen with ice cream. In the next shot, we see him sitting on the couch in the reflection on the TV. However, when we cut back to Ray, he is still in the process of sitting down.
At about 39 minutes into the movie, during the fishing scene when Juan holds up his "PAPI" necklace for Ray, Juan's hands change from left to right, then back to left again.
At 40 minutes, during the fishing scene when the bucket is shot, the hole in the bucket is different than the gunshot hole, the bucket is tipped back showing it's empty.
The next scene, water is pouring out of only one side of the bucket. A gunshot at close range would have gone through the plastic bucket.
The image inside the bucket shows a catfish and only one gunshot hole "possibly".
The bucket has different levels of dirt on it between shots also.
During the initial wide shot of Ray waiting by the river for Ann, the end of the dolly track is visible.