The process at REP to get the visa took less time than the wait to get through the immigration desk, a few metres past the visa desk.

It was fun to watch the process described above.
All of this info is also in the Asia forum.

A US family who arrived on our flight, who are there for a few months to make a film, had trouble with their childrens' visas, due to the officers contradicting the information the family had, which stated the children did not require visas in this case (due to being below a certain age).

As mentioned above it is likely to be an issue that the officers wanted them to pay more money and argued their point that all would have to pay a visa fee.