Ring Finger - S1-E10
Other mistake: When Jackie uses the hammer to smash her Ring Finger, if you watch carefully the prop hammer actually hits her middle finger instead. (00:24:30)
Flowers for Your Grave - S1-E1
Other mistake: Beckett and Co are in the mental patient's apartment. She opens one of Castle's novels. The title page says that it's called "A Skull at Springtime." However, on the opposite page, it says that the book is "Storm Fall." (00:19:50)
Other mistake: It is said G. Callen has lived in 37 foster homes between the ages 5 and 18, the longest ever having stayed in one is 3 months. 5-18 is 13 years, meaning even if he had lived 3 months in EVERY foster home, it'd have to be a minimum of 52 foster homes. Since 3 months was the longest, it is logical that the others were shorter therefore the number would have had to be much higher.
All the Time in the World - S4-E19
Other mistake: Charlotte enters the Duchess' bedroom, walks past Pete & Myka, with her hand behind her back, hiding something. She stands in front of them, trained security people; neither of them notice the gun in her hand (which is visible to the camera, so it is not hidden via artifact), before she shoots her husband.
Other mistake: When Neil is in prison and has time on his hands, he puts pieces together that were shredded. Neil's name in the file is CAFFERTY, not CAFFERY. Also, in the same scene, the words "e've" can be seen with the W missing. Yet, later on, when Neil shows Burke the final photocopied piece, the W that wasn't there is now visible.
Other mistake: When Elena is taken, Bonnie asks Jeremy for help. She says she needs his blood to cast a location spell to find Elena. But it doesn't make sense. Earlier it was revealed that Elena is adopted, so she and Jeremy don't share the same bloodline and cast could not work well.
Suggested correction: Elena was adopted by her uncle. Grayson Gilbert (her adoptive father) is John Gilbert's (her biological father) brother. Jeremy (Grayson's son) is actually her cousin, and related by blood.
Other mistake: Regarding the suicide of Karen Anderson, her boyfriend explains that Karen hadn't been studying with him because she wanted to be in the sun all day, but all the footage of the bridge she jumped from shows it to have been a mostly overcast, gray day. The first shot of the bridge is at the very beginning of the episode and is repeated several times throughout.
Alterations - S1-E7
Other mistake: When Max drives Charmaine to the surgical clinic, watch the background. In the first few shots, they are driving through some sort-of suburban neighborhood if you look out the windows, but suddenly when the camera cuts outside of the car, they're in a parking lot for the clinic, nowhere near the neighborhood they were literally just driving through. There was no time-jump as they are having a continuous conversation through the entire scene.
137 Sekunden - S1-E3
Other mistake: At the beginning of the scene on the plane, Zoey is sending a text message to Demetri. When her phone is in the shot, what is shown on its display screen is obviously edited, because she makes the mistake of pressing the "end call" instead of the "send call" button to send the message. (00:04:55)