I am playing with the Bizhawk emulator, set on Compatibility Mode. Found some issues:
There is a text bug during the PK Soccer Session, in which talking to the boy on the right would cause the dialogue to glitch. It completely obscures the text, along with causing a Missingno effect for some of the background.
During Jim's "Don't Be Unlucky" mini-game, there are minor graphical glitches at the corners of the screen. This seems to happen during the reward dialogue.
The font for the letters 'm' and 'w' are too thin, causing them to be nearly unreadable. They are noticeably different from the font around them.
When the Fishing Team members takes a fish, the "I" "l" and "!" part of their dialogue resembles the unreadable font from #2. To quote the dialogue:
"Sweet Skills! I'll take that."
Yesh. "Y" and "V" this time. I think the pattern is that letters that mirror each other are getting mucked up. EG: "I", "l", and "!". "Y and V". "W" and M". Whenever these messed up fonts pop up, they are shadowed, unlike the white characters of readable font. Upper and lower case like "D" and "d" seem unaffected.
Anyhow, this instance of font-ruination comes from fishing the Luck Rock from beyond the fence.
...Yeah. During the dialogue with gathering a piece of firewood, the following letters are shadowed: "r", "T", "Y", "i", "w", "m", "l", "!". I really hope my next entry is for some other issue, just for variety's sake.