If set to 1, then Latex-Suite will create certain global debug statements which can be printed by doing

:call Tex_PrintDebug()

If Latex-Suite detects that your vim is python enabled (using has('python') and has('python3')), then it tries to use python in certain places to speed things up. If this misbehaves, you can set this to zero, in which case, Latex-Suite will use vimscript to accomplish the same.