When watching the movie, you find out that, Doug Number Four calls Doug Number One, "Steve."

When Number One comes home to fix up his house for his wife, we see Number Four on the balcony.

Number Four says, "Hey Doug, come on up, im spitting on bugs."

During the entire movie, Number Four calls him Steve, except for this moment.

Towards the end, Number Four calls, Number One, "Steve" again.

Does he know his name or not?