When Rachel is in the bathroom getting ready with her friends, she clearly has her shoes on. She sees Chloe and walks out of the room, still with her shoes on. In the next scene when she walks in the room to fix Chloe's food, she has no shoes on, and only goes to put them on after Chloe has put the dog food in them.
The mountain lion scene would be incredibly unlikely in real life. For one, mountain lions are solitary animals and never hunt in groups. Second, they only hunt at dawn or dusk and would never attack in a group out in the open in full sun during the middle of the day.
According to Papi's lovesick speech, Chloe has a raspberry colored nose. Apparently at least two "Chloes" were used. One with the raspberry nose, and one, most notably in the closing romantic scenes with Papi, with a black nose.