Keep in mind that on the show, the bridge was not facing forward, but at an angle*, so that the turbolift bubble could be directly behind the bridge, yet not directly behind the Captain's back.
See this page for more detail. http://www.ottens.co.uk/forgottentrek/tos_1.php
(check the numbered links at the bottom of the article) - pay special attention to how the deck-1 plan compares to the deck-2 plan.
*- this also explains why any time the ship got hit dead-on with anything, the crew would go flying to one side
Keep in mind that on the show, the bridge was not facing forward, but at an angle
The rotation of the bridge to be at an angle to the forward motion axis of the rest of the ship, as shown in that ancient Star Fleet Technical Manual by Franz Joseph (1975), is the stupidiest attempt to have consistency between the interior and exterior shots in Star Trek (The Original Series). That is, the authors were trying to match the location of the turbolift in the bridge set in interior shots with a structure or bulge behind the bridge on top of the saucer section of the Enterprise model shown in exterior shots.
Seriously, the crew on the bridge is facing at an angle to the forward motion of the ship? As though that matters in space, but it's lame.
One reason the authors did that was to try to have the sizes of portions of the ship to be realistic, that is, human-sized, as well as including unseen structures such as lavatories Unfortunately, that didn't leave much room for other turbolift shafts behind the bridge, so the authors rotated the bridge in the name of consistency. Ugh
I prefer to think of that bulge behind the bridge in exterior shots to be some other structure, or even the top of a turbolift shaft into which the turbolift moves after leaving the bridge.
I'm sure that in some dusty file drawer, the original studio set plans called for the turbolift to be directly behind the Captain's chair... but that practical issues such as lighting, tearing away a wall for camera placement, what looked best as a standard camera angle, getting Shatner's "Good Side", and so-on all no doubt played a role in the rotation of the set in relation to the turbolift.
The FX model simply wasn't updated.. and the two issues had to be reconciled (retconned) in the 70s, by Franz Joseph and others. The concept that the bridge is at an angle to the ship is shown consistently on all blueprints and plan drawings I have seen over the years, so I have a feeling this issue was "resolved" by the designers at Desilu before the show wrapped, and passed on as official, to those producing trek merchandise.
And it does make me feel better about the bridge crew always leaning to one side when they were struck by something.