Oh people of SAS, you are amazing!

1. Sometimes you have to use comma between parameters, for example in definition of macro:
        %macro append(columnName=, labelName=);
   But it other cases, like dropping,  you can't use comma between parameters:
         data table(drop=attr1 attr2 attr3);
2. If you type DAAT instead of DATA, your program will run anyway with a polite note in your SAS log telling you that it has assumed you meant DATA and went ahead and executed based on that assumption, but if not, hey, feel free to let it know.