Transitioning from Mainland Mandarin to Taiwan Mandarin—what are the biggest pronunciation traps?

I’ve been learning standard Mainland Mandarin for two years, but my partner is from Taipei and I’m having trouble adjusting to the 'r' (erhua) sound differences and the way they pronounce certain retroflex initials. I want to sound more natural when I visit their family, so are there specific resources to help with the shift in accent?