Okay, I see you are using Intel graphics which Jabo's plugin works quite badly with.
To improve the graphics for this game, I'd use Glide64 + eVoodoo to get rid of the errors. (Both can be found in the download section)
To set this up, you need to extract the eVoodoo files into the Project64 directory and extract Glide64 to the plugin directory of PJ64. After selecting Glide64 from the settings it'll work better, but not perfect still.
I recommend using either:
-Glide64 0.42 + eVoodoo 3.99 Beta
OR
-Glide64 0.5 + eVoodoo 4/Nemesis
Whichever works best for you.