Corrected entry: Del first met Raquel in 1988 in the Christmas episode 'Dates'. At that time, Rodney had not yet met Cassandra (episode was made before series 6 and Rodney was seeing another girl). Del met Raquel again exactly a year later in this episode, and Rodney and Cassandra are somehow celebrating their first wedding anniversary.
Corrected entry: During exchanges between Mr Peterson and Lennox, we find out that there is 60 grand in the safe as Friday is the store's busiest day. When Lennox is taken into the office, the store is still open, so how did the 60 grand make its way from the tills to the office safe? Tender pickups are done after the store has closed. The time when they do attempt to open the safe is quarter past six (after the store has closed) but still there would have needed to be a member of the office staff to bring the money to the safe while the Trotters, Lennox and the other two were in the office. Also a safe would not be located in the manager's office, it would more likely be in the general office or cash office.
Correction: When I worked in a supermarket in my student days, cash was taken from the checkouts every couple of hours. And that was a small supermarket in a small town, not a large supermarket in a busy London suburb. Cash would probably be taken throughout the day to be locked away.
Corrected entry: When Del is first told about the gold bullion (and the character Freddy the Frog) by Trigger's Aunty, Del says he has never heard of him or his reputation. Yet in the final episode, "If They Could See Us Now," Del is seen on a photograph with Freddy the frog and the rest of the gang on a jolly boys' outing, so he surely would have known him. Also after Rodney finds out that Freddy is his real father, he asks Del if he was anything like him and Del goes on to explain what kind of person Freddy was, but how did he know if he never knew him?
Correction: This plot hole is explained in "Rock And Chips", the 2010 prequel to "Only Fools And Horses" set in 1960. Freddy "The Frog" Robdal and Del Boy were indeed both on the first Jolly Boy's Outing to Margate but throughout the entire pilot episode, Del is unaware of who Freddy is and they are never introduced to each other. Even on the bus, Del is happy to lark around with his mates whilst Freddy and "Jelly" Kelly sit at the front looking distinctly unimpressed and not interacting with anyone. It is reasonable to assume that Del would not be interested in knowing Freddy because of their significant cultural (and age) differences as portrayed in "Rock And Chips". After the events of "The Frog's Legacy", Del would have been aware of Freddy's reputation (and may even have recognised him from Rodney's photo despite not knowing his name when it would've been taken) because Renee explained who he was in depth during "The Frog's Legacy".
From Prussia with Love - S5-E1
Corrected entry: When Del Boy is telling Marlene and Boycie about the baby they were going to adopt being a girl rather than a boy, which they'd thought, he says "I know I told you it was gonna be a girl, but it ain't", when he should have said, "I know I told you it was gonna be a BOY, but it ain't".
Correction: The episodes concerned were Christmas specials one year apart but they do not take place at Christmas, and the time frame between each of the episodes could have been more than a year.
In the episode where Rodney and Cassandra get married it shows them signing the wedding register in January 1989. When they go on the jolly boys outing it's still the same year as it's stated on the poster sticking up on the couch.