To further clarify ..... the KLM taxied first and needed to backtrack to the runway threshold to do a '180' before taking-off. The Panam taxied out after the KLM but needed to backtrack then exit on to a taxiway, to get out of the frigging way, to allow the KLM to take-off.
The Panam crew had difficulty understanding ATC in respect of which turning they needed to take off the runway, this confusion went on for a while, the KLM merely needed to follow the runway centre line, he didn't need to count turnings etc. hence why he was faster than the Panam.