What one does if he realizes, during the Shabbat Amidah, that he has begun to recite one of the blessings reserved for the weekday amidah: Berachot 21a
Rushing to the synagogue, and delaying departure from there, on Shabbat: Megillah 23a
Various phrases established by the Sages of the Talmud, currently included in Friday night davening: Shabbat 119a
Mentioning that it is also the first of the month, if this is the case: Eruvin 40b
Mentioning that it is also an one of the intermediate days of Holidays [Chol haMoed], if this is the case: Eruvin 40b
Using "MiKadesh HaShabbat [Who Sanctifies Shabbat]" or "MiKadesh Yisrael [Who Sanctifies the Jews]": Pesachim 117b
Saying "VeShamru" prayer in the Night Prayers: D.Ch. Berachot 1:5:11
The reward for reciting "Vayechulu": Shabbat 119b
Two Angels who bless one who recites "Vayechulu": Shabbat 119b
Reciting "VayeChulu" alone on Friday night: Shabbat 119b
Making Kiddush in the Synagogue, for the guests who will eat there: Pesachim 101a