I had some free time so I looked up some of these on IMDB.com. Look at the Original air dates. Many of these are nearly-if not over-20 years ago now.
The one where...
Data plays Sherlock Holmes and they get trapped in the holodeck - Elementary, Dear Data, Season 2, Episode 3: Original Air Date—3 December 1988
Riker was put onboard a Klingon ship. Some kind of exchange program thing - A Matter of Honor, Season 2, Episode 8: Original Air Date—4 February 1989
Picard tells Q they don't need him and Q sticks the Enterprise in the middle of Borg infested space, Q Who?, Season 2, Episode 16: Original Air Date—6 May 1989
everybody is disappearing one at a time - except Dr Crusher, Remember Me, Season 4, Episode 5: Original Air Date—20 October 1990, Dr. Crusher enters a temporary alternate universe because of an experiment of
Wesley's.
The Troi bad dreams one ..... One moon circles - Night Terrors, Season 4, Episode 17: Original Air Date—16 March 1991
They all lose their memory and try to figure out who they are, Conundrum - Season 5, Episode 14: Original Air Date—15 February 1992
the Enterprise gets destroyed over and over and over and over and over again ..., Season 5, Cause and Effect, Episode 18: Original Air Date—21 March 1992. They called it a Causality Loop and it was used in Doctor Who episode once as well, ( Meglos).
Worf, his son Troi and Data are in a western, and trapped in a holodeck - A Fistful of Datas',Season 6, Episode 8:Original Air Date—7 November 1992.
where they were tracking down ancient civilizations to piece together some puzzle. Something about info in the DNA strands or something like that. The Chase, Season 6, Episode 20: Original Air Date—24 April 1993
Riker is in conflict with Picard and his former Captain- who went batty and made a cloaking device. The Pegasus, Season 7, Episode 12: Original Air Date—8 January 1994
Tasha's Romulan Daughter appeared in several episodes after the set-up in Yesterday's Wnterprise:
The Mind's Eye - Season 4, Episode 24: Original Air Date—25 May 1991. (voice) (uncredited) Tasha's daughter appears in silouette, preserving the end of season cliff-hanger.
Redemption - Season 4, Episode 26: Original Air Date—15 June 1991
Redemption II - Season 5, Episode 1: Original Air Date—21 September 1991
Unification II - Season 5, Episode 8: Original Air Date—9 November 1991 - Last appearance of Sela, Tasha's Daughter.
The one where...
Data plays Sherlock Holmes and they get trapped in the holodeck - Elementary, Dear Data, Season 2, Episode 3: Original Air Date—3 December 1988
Riker was put onboard a Klingon ship. Some kind of exchange program thing - A Matter of Honor, Season 2, Episode 8: Original Air Date—4 February 1989
Picard tells Q they don't need him and Q sticks the Enterprise in the middle of Borg infested space, Q Who?, Season 2, Episode 16: Original Air Date—6 May 1989
everybody is disappearing one at a time - except Dr Crusher, Remember Me, Season 4, Episode 5: Original Air Date—20 October 1990, Dr. Crusher enters a temporary alternate universe because of an experiment of
Wesley's.
The Troi bad dreams one ..... One moon circles - Night Terrors, Season 4, Episode 17: Original Air Date—16 March 1991
They all lose their memory and try to figure out who they are, Conundrum - Season 5, Episode 14: Original Air Date—15 February 1992
the Enterprise gets destroyed over and over and over and over and over again ..., Season 5, Cause and Effect, Episode 18: Original Air Date—21 March 1992. They called it a Causality Loop and it was used in Doctor Who episode once as well, ( Meglos).
Worf, his son Troi and Data are in a western, and trapped in a holodeck - A Fistful of Datas',Season 6, Episode 8:Original Air Date—7 November 1992.
where they were tracking down ancient civilizations to piece together some puzzle. Something about info in the DNA strands or something like that. The Chase, Season 6, Episode 20: Original Air Date—24 April 1993
Riker is in conflict with Picard and his former Captain- who went batty and made a cloaking device. The Pegasus, Season 7, Episode 12: Original Air Date—8 January 1994
Tasha's Romulan Daughter appeared in several episodes after the set-up in Yesterday's Wnterprise:
The Mind's Eye - Season 4, Episode 24: Original Air Date—25 May 1991. (voice) (uncredited) Tasha's daughter appears in silouette, preserving the end of season cliff-hanger.
Redemption - Season 4, Episode 26: Original Air Date—15 June 1991
Redemption II - Season 5, Episode 1: Original Air Date—21 September 1991
Unification II - Season 5, Episode 8: Original Air Date—9 November 1991 - Last appearance of Sela, Tasha's Daughter.
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