Mr Oldfield never entered that flat, it is obvious. Apart from the erroneous description of the flat and the twins, he doesn't make sure Madeleine is in her bed, especially because if he can't see one of the twins, he can see the window bed that is empty..
This is a typically compliance check, but he could be asked to invent that Madeleine was there or not.
At around 9.25pm, the interviewee went into his apartment and Madeleine's apartment to check on the children. He states that the door of the bedroom that was occupied by Madeleine and the twins, was open and that there was enough light in the bedroom for him to see the twins in their cots. That he couldn't see the bed occupied by Madeleine, but as it was all quiet, he deduced that she was sleeping. (MO 4 Sep)
Matt wouldn't necessarily recall the correct layout of the apartment. That room was dark so what colour he thought the curtains were I can forgive as an innocent mistake. Gerry admitted in the documentary that the only time he went in to the bedroom to check that Madeleine was in bed was on the night she disappeared - another revealing fact. And Kate was moaning at the table that he was gone for a long time watching the football

Now everyone knows why that time period 9-9.10 is crucial and his reaction when Jane recalled it.