What should I know about the re-entry process with a DTV in Thailand?

Arrived at Bangkok airport from Vietnam, already have a DTV but my first exit and re entry.

Didn’t need anything other than my passport as the DTV and TDAC is logged under the passport. I did have them available but was told they weren’t necessary (despite the signs stating to have them ready).

I was informed (by the immigration police lady) to always check the passport stamp for the re-entry date on the DTV’s as mistakes have been made (by immigration). Once you leave the airport it can be difficult if there’s is a mistake.

Her colleague on the next desk came over to see my passport and whatever it was they had visibility to on their screens as she had never had a DTV traveller herself and wanted to see.