We've heard about the red bird before, as the fellow in your Twitter convo points out.
A bit after 1:30 --> https://www.youtube.com/watch?v=Y0hJCq3hFCo
What's interesting is that Steve says "comes the cannon," and Grant says "Thats right. Yeah, yeah, we saw her, we saw her a little while ago."
The only canon we've seen was in the trailer and that released a canon ball. Grant could be referring to the background of this screenshot: https://pbs.twimg.com/media/CqAbKu8UkAImjVq.jpg:large
...but a bit surprised he would remember that some character appeared in in the far distance of some screenshot