Nearly 10 minutes of the beginning is repeated from the previous episode. No other episode in the miniseries does this.
When speaking to Marius after the wedding, Valjean says he doesn't know Cosette's real name. This is a rare acknowledgment in an adaptation of Les Miserables that Cosette is not the character's real name. For expediency, most adaptations simply treat "Cosette" as the character's name, as that is what she is know by to most of the other characters. In the original novel. her mother named her Euphrasie but called her by the nickname Cosette, which roughly means "little thing." Valjean further admits her last name is not Fauchelevent. The matter of Cosette's surname is a bit more complicated. Her father's name was Félix Tholomyès, though as Cosette was illegitimate, the Tholomyès family name was never acknowledged. Fantine, Cosette's mother, had no family name of her own, as she was an orphan herself and never knew her parents. Even the name "Fantine" was assumed, as she did not know her own birth name.
When speaking to Marius after the wedding, Jean Valjean identifies himself by the prisoner number 9430. In the original novel, Veljean had two prisoner numbers: 24601 and 9430. The first was assigned to him during his 19 year sentence for stealing bread (plus multiple escape attempts), the second was assigned to him after his re-arrest for violating parole and stealing a 40 sous coin from Petite Gervais. This adaptation omits the second arrest, yet gives him the prisoner number from that event, rather than the original (and, thanks to the musical, much more famous) 24601.