I'm just going with what I said before, I've seen that epi so many times..they had to wheel him out on his side, his back was too badly burned and add in that probable glass in that wound..it had to be that way..plus he was relatively conscious at the time so it was safe to transport him that way.
In the hospital, he may have been on some painkillers, and laying on one side can not only be boring but be uncomfortable, so he may have just switched sides, and regarding continuity..the laying on the side can be explained..the no scars on his back at all in 4x4 may be a little harder to explain away..or that when he was investigating the woman that was on fire, he didn't know what debreeding the burns meant when that had to have been explained to him when he was burned..not to the same extent as hers but anyone that had a burn like he did probably at least heard the term..you have to keep burns clean, they get infected really easily.