-Moira (Karen) is not supposed to be in this episode.

-Lucas has scenes with other characters besides Andy. He has scenes in Tree Hill, not only on Andy's yacht. One is at NH's house.
(credit to AmeliaBeck)

-Michaela was seen on set getting hair and makeup done. The location was a church, and her scenes are taking place in NYC.
(credit to Multiple posters at othforums)

The following (credit to Rebecca:)

-Lucas returns home at the end of this episode.

-Lucas wakes up alone

-There is a time jump of about one month.

-Peyton changes her mind about selling her car and takes a SALE sign down from the Comet

-Lindsey is back in NY debating about Lucas's book..

-Hilarie filmed a scene walking out of CD Alley, getting into her car and driving away.

-Nathan and Lucas fight Dan basically because they think he kidnapped Jamie. (that was the original spoiler about the kidnapping, if you all remember) It appears that the first scene of 5.13 (this one) picks up exactly where 5.12 left off and then the time jump happens.

Information from Showfax Sides

-Scene 23
Peyton is speaking to Max the record store guy. It sounds like the store is doing poorly, or may have closed. Max asks Peyton how long she has been home. She replies that she has been back for a few months. Max then asks if she has heard any good music lately, and when she answers yes, he notes that she didn't get it at the store. Defensively, Peyton responds, "Oh, so it's my fault." Max then reassures her that it's nobody's fault, he even gets his music online now, too. Peyton then tells him the store was worth more than that. Max hopes so: he'd like to think it had something to do with Peyton's cool new record label. That makes Peyton smile, but the smile soon fades. Perceptively, Max asks Peyton if she thinks about Lucas a lot. She's surprised, but replies, "Every day."

-Scene 25
Start of Act 3. Brooke's House. Brooke paces while Patricia watches. Brooke doesn't understand what Lucas has to do with her wanting to adopt. Patricia intuitively notes that Brooke said her friend, Peyton, is a mess because Lucas almost got married. Lucas had a relationship with someone else, Peyton is now hitting the bars... maybe Brooke is looking for love somewhere else? Brooke is annoyed that Patricia is questioning her reasons for wanting to adopt, and tells her that she's completely wrong. Patricia then asks Brooke if she has ever used drugs. Brooke says she doesn't use drugs, but Patricia brings up Brooke's past lifestyle, the fact that she was arrested for shoplifting, and notes that Brooke recently took a drug addict named Rachel Gatina into her home. Brooke doesn't understand where Patricia heard all of this, until she finally realises that Patricia must have spoken to her mother.

-Scene 26
Andy's Yacht: Andy asks Lucas if he has spoken to Peyton since the wedding. Lucas shakes his head. He says that Jamie went missing, then he had to deal with Dan, and then he left. He never had a chance to speak to Peyton. Andy then asks what Lindsey was talking about on the altar. Lucas' book, a comet... Exasperated, Lucas says it doesn't matter that Peyton's car is a comet. If the guy in Lucas' book had seen a white bronco, everyone would be saying that Lucas loves OJ! Andy then asks what kind of car Lindsey drives, to which Lucas responds, "That's not fair."
513 Sides: Max/Peyton/Brooke/Andy/Lucas

-Lucas and Peyton have their first scene together since the wedding.
(credit to Manu)

The following (credit to Rebecca:)

-Lucas is not ignoring Peyton in 5.14. Not at all. LP have a lot of scenes in 5.14

-Two LP scenes filmed last week for sure: LP at Peyton's office (at night, I believe) and on the street. No news on the content yet.

-They were looking for extras that play airline passengers

-They will film at a baby store, Tric (Peyton's office), school and the hospital. "I'm pretty sure the hospital scenes have nothing to do with Brooke and the possible baby."

-Hospital scene was shot including Chad, James, Jackson, and Paul for sure. "Joy was definitely on set, but I am not positive if she was in the hospital scenes or not." Chad, James, and Paul are filming more scenes outside the hospital.

-Chad, Hilarie, and Sophia will film scenes at the studio.

-There is a scene where Brooke, Peyton, and Haley gather baby supplies. Lucas, Nathan, and Jamie are also in this scene which I think takes place at NH's house.
(credit to Taylor)