First,
Mercury Capsule. In one of the blueprints shown, there is the drawing of an Atlas rocket with the Mercury Capsule snuggled in at the top. The words "MERCURY CAPSULE" are readable.
Second,
unknown ship towards end of credts. This ship which has been discussed before I think is the immediate predecessor to the Enterprise NX-01. Both ships feature up-swept pylons, a supporting structure between the nacelles, and a forward primary hull. I think the large engines seen in the center of this ship are the impulse engines, which are later placed more to the side on the later ship. This is to make room for the weapons module.
After this opening-credit vessel, I don't think we have seen that many or that large impulse nozzles in other designs. The NX-01 is an intermediate step, after which three separate nozzles becomes plenty, and four (as in Akira) is something like the absolute maximum.
Timo Saloniemi