Can I cause a car to stop for me on Shabbos?

Episode #01: 

• Is there a halachic problem when the lines of a mezuza (and by extension tefillin and sefer Torah) are not exactly parallel, gradually becoming wider or narrower, and how many such lines constitute an issue?
• May one rely on correcting such non-parallel lines (e.g., by stretching or shrinking letters) without creating a problem of shelo kesidran?
• How should one deal with the halacha of not giving food to someone who will not make a Bracha when this concerns non-frum siblings or guests, and what are acceptable solutions?
• Is it appropriate to use a large amount of water for Netilas Yadayim (washing “b’shefa”), or is this considered excess, gaavah, or bal tashchis in contemporary circumstances?
• When walking on Shabbos in the street, is there any prohibition in causing a car (even driven by a Jew) to stop or slow down because of your presence?
• If money was left in a coat pocket going into Shabbos, does the coat become a basis l’davar ha’asur and muktza, and does it depend on the type of pocket (shirt‑style vs. sewn-on pocket)?
• When a person makes a Bracha on a Mitzvah to be motzi others (e.g., kiddush, Chanukah candles, leishev baSukkah) and then speaks before doing the act, are the listeners still yotzei the Bracha?
• In Chutz La’aretz, if one forgot to separate challah before Shabbos and leaves over bread for hafrashas challah after Shabbos, what is the correct way to leave that portion, and what if one mistakenly designated an entire loaf as challah?
• When separating challah after Shabbos from bread that was eaten on Shabbos without prior hafrashas challah (in Chutz La’aretz), does one recite a bracha at that time?