Turns out in Chapter 2 you can actually grab Wheatley when he peeks through the walls through various test chambers.
Edit: Turns out you can do this in the Companion Cube room also. Still looking for more places to grab Wheatley
Here's a picture:

Does grabbing him elicit any response or other action? If not I'm guessing it's just an overlooked bug.

Its just a bug. He doesn't do anything (but stare, in a semi-creepy way) or react to the environment in any way. You can take him to the elevator, but he just falls through the floor if you let go of him, and he can't follow you to the next map.

In the companion cube room, GLaDOS says something if you keep him with you, but he doesn't respond to you. I'm surprised nobody caught this.
_B4xb1KDFys

MasterLagger wrote:
In the companion cube room, GLaDOS says something if you keep him with you, but he doesn't respond to you. I'm surprised nobody caught this.

That's the standard line that plays if you trap yourself by leaving the CC up there without any portals. I guess the trigger just detects Wheatley as a physics object, lolz.

Random wrote:
MasterLagger wrote:

In the companion cube room, GLaDOS says something if you keep him with you, but he doesn't respond to you. I'm surprised nobody caught this.

That's the standard line that plays if you trap yourself by leaving the CC up there without any portals. I guess the trigger just detects Wheatley as a physics object, lolz.

Really? Huh, never heard those lines before.

MasterLagger wrote:
Random wrote:

MasterLagger wrote:

In the companion cube room, GLaDOS says something if you keep him with you, but he doesn't respond to you. I'm surprised nobody caught this.

That's the standard line that plays if you trap yourself by leaving the CC up there without any portals. I guess the trigger just detects Wheatley as a physics object, lolz.

Really? Huh, never heard those lines before.

I found this funny, because the same line is in your aatc map.

Another Bad Pun wrote:
I found this funny, because the same line is in your aatc map.

I should have been more specific, I never heard the line being spoken in the Companion Cube room when playing SP on my own. I heard it on the video, but not personally in-game (beside using the "deranged loneliness" quote). BTW thanks for playing my map.

Using the Model Viewer, Wheatley actually has a "fizzler_flinch" animation. I think that this means that at some point in development, Wheatley was to be taken through an Emancipation Grill. It must have been removed, I guess.