Other issues to watch out for when food, wax, etc. is attached to the part where there is no letters, numbers, etc.
(Melting ice.) making instant coffee, tea and other powdered drinks on Shabbos;
Measuring for a mitzvah - "מדידה של מצוה". Preferably should be done on "ערב שבת".
Some more important concepts about "SHEMA YISCHOK" (one might come to squeeze out a garment).