Other than uniformed officers a good psd, while well armed, would be discreet. Someone may flash a weapon if their suit coat was pushed back, but they tend to be pretty good about keeping the firepower out of sight. It is likely that there was more than one layer of security and what was seen was only what was by design most visible.
As for the comment about CCW holders carrying in Disneyland, while possible, it is not as likely as other areas as CA permits numbers are pretty low per capita. Disneyworld on the other hand would likely have a goodly number of CCW holders carrying as FL has a good number of CCW holders and honors most other states.
Very cool for the Sultan to be in the park with Joe Public. Lots of work for his psd though. It would be cool to see some pictures of how he rolls.