What were the 2011 Easter Eggs?

I remember back in 2011 after we got the teaser trailer for Halo 4, Frank O’Conner told us that the teaser trailer had several easter eggs that we would notice or realize later.

Since then, nothing has been discussed about it. So does anyone know exactly what they were?

-Ryan

I don’t remember anything about him saying that, but I’ve been wrong A LOT. I know that the sticky detonator was first shown, although we didn’t know it at the time.

Yeah I would have to agree with ZnaZanz here on this one, I don’t ever recall him ever saying that, but I could be wrong.although the only 2 I can think of are the sticky detonator, and the FUD being pulled into Requiem.