Just after Felicia has finished drawing the rose on Carl's hand, his hand is resting on a pillow and the rose can be seen in close-up. It is surrounded by four green leaves. Felicia then takes Carl outside to "look at it in the sunlight". Once outside, it can be seen that the rose is now surrounded by five green leaves. The leaves are also differently shaped.
When Carl first arrives at Felicia's house, Felicia is wearing a black robe with a 2 inch wide green satin trim on the sleeves. In the scene where she gives Carl a glass of lemonade and then holds his hand, it is plainly visible that the trim is completely torn along a seam. Felicia then walks into another room and starts unfolding something at a table. The same seam is visible again, but it's now intact and not torn.
During the opening credits (at 5 minutes into the film..at the "Screenplay by" credits), as the camera circles above the characters swimming, the helicopter shadow can be seen in the lower right corner as it circles.
The limited production of the film is evident when the lake scenes with Carl and Willie, as well as those in Africa, were both shot at the same location in Malibu.