Goofs

When Roz first tries teaching the gosling to fly, she launches him high into the sky, where a flying bird swoops over and grabs him in midair. Immediately after, Roz has him back in her hand, even though the bird should have him.

In one scene the fox talks about hibernating. Foxes do not hibernate.

When the fox enters the lodge, a moose near the doorway grunts but the sound effect used is a recording of a bear.

At 43:12, Roz can be seen touching the projection on the cave wall with her hand and casting a shadow onto it. However, the object (also with its own shadow) creating the projection is in her other hand. So, not only should it not have had its shadow, but it should have been placed on top of a rock or something so that the projection would remain still and Roz' shadow would be visible.

When Roz activates "learning mode" to learn the animals language, she pulls out a tablet and presses some buttons to do it. It wouldn't make much sense for a robot to have to pull out a device and enter inputs to perform a certain task, instead of just doing the task by itself.

Roz is designed to aid people. The tablet is for her operators to add or change her programming - in this case, learning mode. Since she was unable to communicate with any living being on the island, it's likely that she was programmed to input the order herself. Granted, it's possible that she could enter this state by her own will, but at that moment she was fully following her programming.

Except for the geese, there were not enough members of each species of animal on the island to sustain the population. Those species would soon go extinct. Unless there had been a mass extinction event prior to the movie, it was impossible for the island to end up with so few animals.

The robot pulled out a machine that was acting like it's own heart and replaced it with the duck (wtf) to act like living things not a machine. The emotions are understandable but However technically it's not possible for a Machine.