Types of ticket, pp. 171-72
In January 2025 major changes to tickets in Paris and the Ile de France came into effect.  Cardboard tickets will be phased out by the end of 2025 and replaced by two flat-rate tickets for the whole region, loaded onto a plastic or virtual card called Navigo Easy. A Paris métro ticket now costs 2.50€ and will take you anywhere in Paris and the Ile de France by train. You will need a separate ticket for any bus or tram in Paris or the Ile de France, costing 2€. The best detailed guide to the changes in English is on the Secrets of Paris website, https://secretsofparis.com/practical/getting-around/public-transportation/

Lagny-sur-Marne, pp. 65-67
For the 4 km walk to the Jardin des Sculptures it is easier to follow the GR right turn sign onto the Chemin de Quincangrogne rather than trying to follow the towpath beyond this point.

La Ferté-sous-Jouarre, p. 83
Chez Martine is now run by a young Chinese owner but has kept its old-fashioned local ambiance and clientèle. The friendly waitress said of course we could eat our sandwiches there, although the café now does food on Sundays. It was open at 5 pm on Sunday afternoon, the only café in town which was. We said a quiet goodbye as we left and were answered by a chorus of friendly ‘Au revoirs’ from our neighbours.

p. 89 Jouarre
Les Terrasses de la Crypte brasserie has closed, as the old building is unsafe. Le Vincennes café is closed for renovation so at the moment there are just two fast-food takeaway places in Jouarre.