So, if we take for grantede the "dreamlike distortion of actual events" there are things that still need to be explained.
1. There were two aliens.
2. From Ripley's experience - one egg = one facehugger = one alien.
3. In order to account for the two aliens, we have to assume one of a few possible scenarios:
* The queen laid two eggs on the dropship.
* The queen laid one egg on the drop ship but the resulting facehugger can impregnate two hosts - one with a queen.
* The queen laid one egg and there was another facehugger already on board - perhaps brought on board with the queen.
So even taking into account the dreamlike state, assumptions and theories still need to be put forth to explain what happened.