SAVANNAKHET UPDATE:
Applied for another 60 day TV yesterday but was told I needed a bank statement (20,000 bt min.). I have never been asked for a bank statement at this location before, but they may have noticed the build up of TVs in my passport and so asked for this requirement...fortunately they are giving me till Monday to show proof but they didn't ask for proof of an outward flight.
TLDR : Answer Summary
A user reported they needed to provide a bank statement showing a minimum balance of 20,000 baht when applying for a 60-day TV visa in Savannakhet. This requirement was surprising since they had not been asked for it in previous applications. Comments confirm that while this has been a general requirement for a couple of years, its enforcement can vary. Additionally, there are discussions about how recent the bank statement should be and the possibility of depositing the required amount into a Thai account just before the appointment.