I'm sure he meant he was the first person to declare for the match, but at this point it would just make more sense to have him be the first guy to enter. "You guys... I didn't mean I was going to be the first guy to come out for the match." is a whack promo to have to cut on Raw.
As far as Big Show’s entry number, there was some initial confusion, but it was previously reported that WWE did confirm Show is just in the Rumble match itself; not the #1 entry like it was speculated.