The most remarkable backtrack ever for me was when Gerry McCann changed his statement as to how he gained access to the apartment on the night Maddie disappeared. Initially he told the PJ investigators that he walked the long way round and entered via the car park and the front door of the appartment. This later changed to he used the steps up from the street to the back patio and entered via the patio doors.
I can understand a minor lapse of memory but this was a substantial failure to remember important details. When you look at this in the context of Maddie's unexplained disappearance from the apartment then several scenarios become very apparent.
We've had this conversation before on another thread.
What I find most likely is that the cop asked Gerry to describe the flat (via the interpreter) and scribbled a few notes down, including the fact that one door required a key to enter. That doesn't appear in the report, but if he didn't, he should have done. Enter confusion as to which door is the back one versus the front one, and the cop assumes that it's the one that needed a key, which is what he types up.
Gerry's preoccupation was to get the ball rolling as fast as possible to find her, not to check if every detail had been accurately recorded.
As far as anyone knows, he didn't have a translated version to read through. It's not even clear if the "interpreter" read out the entire Portuguese statement to him, as opposed to reflecting back to him what the cop summarised what he thought he'd understood as he went along.
E.g.,
"So at around 9 pm, you went into the apartment via the (confusion over which side is back / front) door and went to check on your children?"
"Yes."
Cop checks his scribbled notes, mistakenly adds the detail of the key, and job done.
If the statement had been verbatim, it would be clear if there had been confusion about which door was the back or front, or not, and - if so - who got confused and how.
Personally, I don't think any of them were very awake that morning. The statement says that Gerry went to the "club" and entered the "room" via the door with the key. Which "club"? Which "room"? Gerry wouldn't have said that he went to the "club", as opposed to apartment / flat, surely?