The halacha of Rabbi Yehoshua ben Levi that a city is treated as 4 amot is "prophetic words"- various interpretations of this concept of prophecy in the post Temple era

The city that only has one entrance vs. a city that has road with an entrance and exit- is the status based on straight vs. curved roads or the ability to go from one end to the other without obstruction?

The measuring procedure for the Shabbat boundary, ir miklat- city of refuge, and the eglah arufa- beheaded heifer in a murder case investigation

Rav Ashi's calculation of the extra space beyond the limits of the Levite city- application of this calculation to discussion in halacha about the requirement to use a microscope while checking sharpness of knife for shechita, bugs in food, etrog on sukkot

The extra 2000 amot of land around the Levite cities, how it was calculated, and why it has unique status in the land of Israel

How to interpret the pasuk of lo bashamayim hi- is it a reference to Torah Study or Teshuva?

The story of Rabbi Preida and the student who needed to study the shiur 400 times, application to the idea of maaser of one's time for others

The debate between Rav and Shmuel about the "new" King of Egypt and its application to a debate in monetary law

The penalty of going beyond the shabbat boundary and this law also being learned from the prophet Yeshayahu

Quoting a halacha in the name of a Sage that never said it- when this is allowed and how it fits with contradicting statements from other places in Shas